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Python while Keyword

By IncludeHelp Last updated : December 07, 2024

Description and Usage

while is a keyword (case-sensitive) in python, it is used to create a while loop.

Syntax

Syntax of while keyword:

while condition:
  statement(s)

Sample Input/Output

cnt = 1 # counter
# loop
while cnt<=10:
  print(cnt)
  cnt += 1

Output:
1
2
3
4
5
6
7
8
9
10

Example 1

Print numbers from 1 to n.

# python code to demonstrate an example 
# of while  keyword 

# Print numbers from 1 to n
n = 10

cnt = 1 # counter
# loop
while cnt<=n:
  print(cnt)
  cnt += 1

Output

1
2
3
4
5
6
7
8
9
10

Example 2

Iterate a list and print its elements

# python code to demonstrate an example 
# of while keyword 

# Iterate a list and print its elements 

# declare a list
cities = ["New Delhi", "Mumbai", "Chennai", "Banglore"]

index = 0 # index/counter

# loop to iterate the list
while index<(len(cities)):
  print(cities[index])
  index += 1

Output

New Delhi
Mumbai
Chennai
Banglore